MANUAL OF THE GRASSES OF THE UNITED STATES 435 



narrow-fusiform, villous with white hairs, those at the summit about 

 2 mm long, forming a brushiike tip; awn 14 to 20 mm long, twice- 



geniculate. QJ. Mesas and rocky slopes, Colorado, 



Utah, New Mexico, and Arizona (fig. 917). 



24. Stipa lemmoni (Vasey) Scribn. LEMMON NEE- 



DLEGRASS. (Fig. 918.) Culms 30 to 80 cm tall, sca- 



berulous, usually puberulent be- 

 low the nodes; ligule 1 to 3 mm 



long; blades 10 to 20 cm long, 



flat or involute, 1 to 2 mm wide, 



or those of the innovations very 



narrow; panicle 5 to 12 cm long, 



narrow, pale or purplish ; glumes 



8 to 10 mm long, rather 



broad and firm, somewhat ab- 



acuminate, the first 5-nerved, 



FIGURE 919. Distribution of 

 Stipa lemmoni. 



X 1; lemma and 

 summit of sheath, 

 X 5. (Griffiths 

 201, S.Dak.) 



FIGURE 917. Distribution of 

 Stipa scribneri. 



the second 



Fiofet, 3-nerved; lemma 6 to 7 mm long, pale or light brown, 

 the callus rather blunt, the body fusiform, 1.2 mm 

 wide, villous with appressed hairs; awn 20 to 35 mm 

 long, twice-geniculate, appressed-pubescent to the 

 second bend. 91 Dry open ground and open 

 woods, British Columbia to Idaho and California 

 (fig. 919). 



25. Stipa viridula Trin. 

 GREEN NEEDLEGRASS. (Fig. 

 920.) Culms 60 to 100 cm tall; 

 sheaths villous at the throat, 

 often rather sparingly so, more 

 or less hispidulous in a line across 

 the collar; ligule about 1 mm 

 long; blades 10 to 30 cm long, 



1 to 3 or even 5 mm wide, flat or, especially on the 

 innovations, involute; panicle 10 to 20 cm long, 

 narrow, rather closely flowered, greenish or tawny 

 at maturity; glumes 7 to 10 mm long, hyaline-attenuate; lemma 5 to 

 6 mm long, fusiform, at maturity plump, more than 1 mm wide, the 

 body at maturity brownish, appressed-pubes- 

 cent, the callus rather blunt; awn 2 to 3 cm 

 long, twice-geniculate. 01 Plains and dry 

 slopes, New York (Cobbs Hill, Rochester), Wis- 

 consin to Alberta, south 

 to Kansas and New Mexico 

 (fig. 921). 



26. Stipa robusta Scribn. 

 SLEEPY GRASS. (Fig. 922.) 

 Culms robust, mostly 1 

 to 1.5 m tall; sheaths 

 villous at the throat and 

 on the margin, a strong 



hispidulous line across the collar; ligul'e 2 to 4 

 mm long; blades elongate, flat or on the innova- ,, 



- 'ij.ii i?li i FIGURE 922. Stipa robusta. 



tions involute, those of the culm as much as Panicle, x y 2 ; lemma, x 5. 

 8 mm wide; panicle narrow, compact, often < Hitchcock 13280 ' N - Mex -> 

 more or less interrupted below, as much as 30 cm long and 2 cm 

 thick; glumes about 1 cm long, attenuate into a fine soft point; 



FIGURE 921. Distribution of 

 Stipa viridula. 



